Exactly 195 digits have been used to number the pages in a book.
How many pages does the book have?

Alien Counting

Stage: 2 Challenge Level:

There is a lot to explore in this challenge!
Have you tried writing out numbers above 7 for each alien?
Can you find numbers that the aliens used to count the children in
the classroom that look the same to the humans looking at the
masks?
Do let us know what you discover.Please don't worry that your
solution is not "complete" - we'd like to hear about anything you
have tried.
Teachers - you might like to send a summary of your children's
work.

The NRICH Project aims to enrich the mathematical experiences of all learners. To support this aim, members of the
NRICH team work in a wide range of capacities, including providing professional development for teachers wishing to
embed rich mathematical tasks into everyday classroom practice. More information on many of our other activities
can be found here.